the numbers that i have found are :157,25,50,100,300 but the most importand is 157------------------examples:------------------circumference of a circle:C=2pi.r

6.28x6=37.68using these numbers:157x6/25=37.68

6.28x79=496.12using these numbers:157x79/25=496.12

6.28x258=1,620.24using these numbers:157x258/25=1,620.24-----------------------------------------------------------------------------area of a circle:A=pi.r^2

3.14x8^2=200.96157x8^2/50=200.96-------------------------------------------------volume of a sphere: V=4pi.r^3/3

12.56x8^3/3=2,143.573333157x8^4/300=2,143.573333--------------------------------------------------surface area of a sphere:SA=4pi.r^2

12.56x8^2=803.84157x8^3/100=803.84---------------------------------therefore 157/50=3.14 157/25=6.28if interested what is the secret behind this number give me a buzz at gothictower00@yahoo.com much happy to explain!!